An analysis has been made of the spectrum of the carotenoid absorption band shift generated by continuous illumination of chromatophores of the GlC-mutant of Rhodopseudomonas sphaeroides at room temperature by means of three computer programs. There appears to be at least two pools of the same carotenoid, only one of which, comprising about 20% of the total carotenoid content, is responsible for the light-induced absorbance changes. The 'remaining' pool absorbs at wavelengths which were about 5 nm lower than those at which the 'changing' pool absorbs. This difference in absorption wavelength could indicate that the two pools are influenced differently by permanent local electric fields. The electrochromic origin of the absorbance changes has been demonstrated directly; the isosbestic points of the absorption difference spectrum move to shorter wavelengths upon lowering of the light-induced electric field. Band shifts up to 1.7 nm were observed. A comparison of the light-induced absorbance changes with a KCl-valinomycin-induced diffusion potential has been used to calibrate the electrochromic shifts. The calibration value appeared to be 137 +/- 6 mV per nm shift.
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http://dx.doi.org/10.1016/0005-2728(77)90112-8 | DOI Listing |
Anal Chem
January 2025
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China.
An in situ monitoring reaction can better obtain the variations during the progression of the photocatalytic reaction. However, the complexity of the apparatus and the limited applicability of substances are the common challenges faced by most in situ monitoring methods. Here, we invented an in situ infrared optical fiber sensor to monitor the reactants and products during photocatalytic reaction.
View Article and Find Full Text PDFIncontinence Management has long been overlooked as a normal part of aging and the national standard of care has become changing individuals every 2 hours. While this was effective for decades, it is no longer providing results and even more challenging for those suffering from Dementia. Over 50% of nursing home residents are incontinent with over 57% of each shift of a certified nursing aide being attributed to incontinence care and management.
View Article and Find Full Text PDFSmall
January 2025
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China.
Polymer composite materials encounter considerable challenges in sustaining superior tribological properties at high rotational speeds. Inspired by the microstructure of dragonfly wings, a novel thermally stable and ambient pressure curing poly(urea-imide) resin (PURI) with excellent tribological properties has been eco-friendly synthesis using bio-based greener solvents. Furthermore, The PURI composites enhanced with polyether ether ketone (PEEK) and Polytetrafluoroethylene (PTFE) blended fabrics demonstrate excellent mechanical, with tensile strengths exceeding 175 MPa.
View Article and Find Full Text PDFSci Rep
January 2025
Botany and Microbiology Department, Faculty of Science, Al-Azhar University (Girl Branch), Cairo, Egypt.
Biosynthesized nanoparticles have a variety of applications, and microorganisms are considered one of the most ideal sources for the synthesis of green nanoparticles. Icerya aegyptiaca (Douglas) is a pest that has many generations per year and can affect 123 plant species from 49 families by absorbing sap from bark, forming honeydew, causing sooty mold, and attracting invasive ant species, leading to significant agricultural losses. The purpose of this work was to synthesize titanium dioxide nanoparticles (TiO-NPs) from marine actinobacteria and evaluate their insecticidal effects on Icerya aegyptiaca (Hemiptera: Monophlebidae), in addition to explaining their effects on protein electrophoresis analysis of SDS‒PAGE proteins from control and treated insects after 24, 72 and 120 h of exposure.
View Article and Find Full Text PDFComb Chem High Throughput Screen
January 2025
Jining NO.1 People's Hospital, Jining, Shandong 272011, China.
Objective: The objective of this study is to analyze and identify the main chemical components and blood-absorbed components of Xuantu Granules and predict their pharmacological substance basis and mechanism in the treatment of DKD.
Methods: A DKD rat model was established by feeding SD rats a high-fat and high-sugar diet and administering intraperitoneal injections of streptozotocin (STZ). The therapeutic effect of Xuantu granules was evaluated.
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